Ashy Storm-Petrel
Hydrobates homochroa
Medium-sized, dark-rumped storm-petrel with a long, deeply notched tail and grayish tones to the plumage. Usually flies fairly directly with light fluttering wingbeats; can be stronger in windy conditions. Look for pale stripe on underwing (not always obvious). Distinctive within limited range, exclusively off California and northern Baja. Rarely seen from land. Gathers in large flocks, often resting together on the water; can be mixed with other storm-petrel species.
识别特征
The ashy storm petrel (Hydrobates homochroa) is a small, scarce seabird of the storm petrel family Hydrobatidae. It breeds colonially on islands off the coasts of California and Mexico, and is one of six species of storm petrel that live and feed in the rich California Current system.
分类信息
The ashy storm petrel was first described by American ornithologist Elliott Coues in 1864. Both its common and scientific name, homochroa, "uniformly colored", from Ancient Greek (h)omoia (όμοια), "alike" + "chroma" (χρώμα) "color", come from its coloration.<p>It was formerly defined in the genus Oceanodroma before that genus was synonymized with Hydrobates.
- 学名
- Hydrobates homochroa
- 命名信息
- (Coues, 1864)
- 目
- Procellariiformes
- 科
- Hydrobatidae
- 属
- Hydrobates
分布与栖息地
Breeding range: PO : islands of Van Damme Cove (Mendocino Co.); Bird Rock (Pt. Reyes), and Farallon Is. (w of c California); Channel Is. (w of s California); Coronado Is. and I. de Todos Santos (w of nw Baja California, nw Mexico). Non-breeding range: coastal California Current to n California (including Monterey Bay) and nc Baja California (nw Mexico).
- 繁殖区
- PO : islands of Van Damme Cove (Mendocino Co.); Bird Rock (Pt. Reyes), and Farallon Is. (w of c California); Channel Is. (w of s California); Coronado Is. and I. de Todos Santos (w of nw Baja California, nw Mexico)
- 非繁殖区
- coastal California Current to n California (including Monterey Bay) and nc Baja California (nw Mexico)
- 迁徙
- Complete migrants
行为
Migration pattern: Complete migrants.
保护状况
Population trend: declining.
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Chestnut-capped Blackbird
Chrysomus ruficapillus
Medium-sized blackbird found in marshes, wet grasslands, and occasionally agricultural areas. Males are mostly black with a chestnut forehead, crown and throat. Females are dark brown above with faint streaks and olive-brown below with a buff throat. Highly gregarious, may gather in huge groups of up to 1000 individuals.
Green-backed Gerygone
Gerygone chloronota
Small plain bird with thin bill. Upperparts greenish brown, underparts mostly off-white, with gray crown, sharply contrasting white throat. Inhabits variety of tropical habitats, usually near water. Forages unobtrusively in mid-canopy. Calls sound more urgent than those of other gerygones.
Long-tailed Thrush
Zoothera dixoni
Earthen-toned and rather heavy-bellied thrush. Matte brown above and white below with dense black scaling on the underparts. Chinese Thrush and species of the Alpine Thrush complex can be similar; note Long-tailed’s wingbars, fine scaling (not solid dots), and proportionally longer tail. Forages on the forest floor in foothill and montane forest, especially in areas with rhododendrons and conifers; descends in elevation in the winter. Song sounds tired and drawn-out, consisting of long buzzy notes and hoarse warbling.
开始您的观鸟之旅
在户外识别鸟类，并在下一次观察时随手查阅鸟类图鉴。